Deep Beam Design – Direct Modeling(2)

Deep Beam Design – Direct Modeling(2)

http://astruttie.aroad.co.kr/help/Tutorial1/AStrutTie-Tutorial-DeepBeam.html

Truss

– Select [Truss]

– Click [Create Truss From Boundary]

Offset : 0.100 → [OK]


Load Assign

– View Option- Boundary Load : True

– Select two of the top of the absence by dragging

 Click [Boundary Load to Truss Load]


Set Restraint

– Select the leftmost joint of the lower part

[Assign Restraints]

Set hinge

Select the rightmost joint of the lower part

[Assign Restraints]

Set roller


Create Inner Element

– [Add Combined Shape]  The function is activated only in Professional Version.

Select 2
Apply to left and right

– Center-top, bottom member combination

– Delete – Unnecessary element

– Truss Modeling is complete.


Define Tie Types

– Truss members are all created and proceed to tie and strut member settings.

Click [Define Reinforcement Ties]

– Click [Add]

Rebar Name = Upper

Rebar Type = Main Rebar

Main Rebar Type = Top Main Rebar

Centroid of Rebar (mm) = 100.0

1st Cycle Rebar Diameter = #8

No. of 1st Cycle Number = 8

Click [Add]

Rebar Name = Lower

Rebar Type = Main Rebar

Main Rebar Type = Bottom Main Rebar

Centroid of Rebar (mm) = 100.0

1st Cycle Rebar Diameter = #8

No. of 1st Cycle Number = 8

Click [Add]

Rebar Name = Shear

Rebar Type = Shear Rebar

Shear Type = Vertical Shear

Diameter = #10

Number of Legs = 2

Rebar C.T.C (mm) =300


Assign Tie Types

– Select upper element

Click [Assign Tie Type]

Choose [Upper] → O.K

– Select bottom element

Click [Assign Tie Types]

Choose [Lower] → O.K

– Select center element

Click [Assign Tie Types]

Choose [Shear] → O.K


Bearing Plate

– Select load acting node

Click [Assign Bearing Plates]

Vertical plates

B = 400mm

L = 350mm

T = 50mm

Effective Width = 400mm

[OK]


Max. Width and Outer Element

– Click [View Options]

Max. Strut/Tie Width –  On

Click [Calculate Max. Width ]

The available widths of all elements in a strut-tie model, calculated automatically by the program,

are displayed by executing the function DESIGN-Element Information or ASSIGN-Outer Element.

The available widths can be modified.

– Technical Reference

The protrusion at the top is the max width considering the bearing plate.
If you want to change the max width of a member, you can change it by two methods.

The first is assign of Outer Element, the second is edit of Element Information.

Reducing the maximum width with this function will result in a more secure design, but overshooting can be over-designed.

– Technical Reference – example

Select Element 5

Click [Outer Element]

I : 247.3

Click [OK ]

Double Click [No. of Element]

Element 7,  I-Width : 0.353

Element 8,  I-Width : 0.353

Element 9,  I-Width : 0.247

Click [Close ]


Assign Strut Types

– Select all element

Click [Assign Strut Types]

Choose [Prismatic Strut] → O.K

– Technical Reference

In this example, all struts are set to Prismatic, but you can apply them differently at the designer’s discretion.

An indeterminate truss will show different results depending on the selected strut type.


Truss Analysis and Design Review

1. Truss Analysis

– Click [Renumbering]

– Click [Run Analysis]

2. Design Review

– Click [Design Review]

Need to increase the amount of lower rebar.

Click [Define Reinforcement Ties]

Lower 1st Cycle Diameter : #9 →[OK]

Click [Design review]

Main Rebar Tie is OK.


Report Preview and Save Report

– Move to [Report] tap

Double Click [Report Preview]

Check off : LC02:1.30D → [Preview]

– rtf, xlsx output are proceed in the same way.

http://astruttie.aroad.co.kr/help/Tutorial1/AStrutTie-Tutorial-DeepBeam.html